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(No Model.) 2 SheetsSheet 1.

E. GBLLISON VALVE GEAR FOR GAS ENGINES.

Patented Nov. 30,1897.

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m. msu moron n c UNITED STATES PATENT EDMUND OELLISON, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO THE PENNSYLVANIA IRON WORKS COMPANY, SAMEPLACE.

VALVE-GEAR FOR GAS-ENGINES.

SPEGTFIGATION forming part of Letters Patent No; 594,381, dated November30, 1897. Application filed October 21, 1896- Serial No. 609,631. (Nomodel.)

. To all whom itmayrconcern:

Be it known that I, EDMUND OELLIsoN, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inValve-Gear for Gas-Engines; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates'to gas or vapor engines, and has especial referenceto the valvegear used to ignite the charge in the cylinder and operatethe exhaust-valve; and it consists in certain constructions which willbe fully disclosed in the following specification and claims.

In the accompanying drawings, which form part of this specification,Figure lrepresents a longitudinal section, partly in side elevation, ofaportion of my improved valve-gear; Fig. 2, a like View of the remainingportion of the same; Fig. 3, a vertical section, partly in sideelevation, taken through the masterwheel of the driving mechanism; Fig.4, a like View showing the position of the parts at the starting of theengine; and Fig. 5 is a section on the line 5 5, Fig. 2, the full linesshowing position of the crank-arm and igniter-rod just after ignition,and the dotted lines show the extreme'positionof the arm and rod toengage with the igniter at its lowest position.

Reference being had to the drawings and the letters thereon, A indicatesthe crankshaft of the engine, on which is secured a pinion B, whichengages the master gearwheel 0 and which constitutes the drivingmechanism of the valve gear. The gearwheel 0 is secured to theengine-frame D by a bolt a, on which bolt the gear-wheel revolves, andon the face of the gear-wheel are cams Z) c, and on the hub of the wheelare cams d, e, f, and g, the function of which cams will hereinaftermore fully appear.

The shaft of the valve-gear consists of three separate concentricshafts, which are so operated that they oscillate or reciprocate onlywhen broughtinto use to efiect ignition of the charge in theengine-cylinders, opening the exhaust-valves to discharge the wasteproducts from the cylinders and for the relief of compression to aid instarting the piston on its first power stroke. The outer shaft E isprovided at one end with an arm h, supporting a friction-rollert', whichengages the cam tom the face of the gear-wheel (Land the shaft isoscillated thereby, and'at the opposite end of the shaft E is acrank-arm k, to whose wrist-pin Z is connected a pitma n-rod m, whichoperates the igniter of an engine. (Not shown.) The inner shaft E isprovided with a like arm n andfriction-roller 0 at one end, whichengagesthe cam c on the gearwheel 0, and said shaft is oscillatedthereby, and at the opposite end of the shaft F is a crank-arm p, towhose wrist-pin q a pitmanrod '1" is c0nnected,which operates theigniter (not shown) of another engine-cylinder, and the middle shaft Gis provided at one end with a bifurcated lever H, whose arms 5 t bearfriction-rollers it 1;, which are engaged by the cams d and ealternately to open the exhaust-valves of the engines to discharge thewaste products and by the cams f and g to open the exhaust-valvesslightly to relieve compression to aid in starting the engine. Theexhaust-valve stems to y are operated by arms a 11, attached to theopposite or outer end of the shaft F, as the shaft is reciprovalves, andthe valves are closed automatically by the springs c d bearing againstthe inner sides of the arms a b and against the exhaust-valve cases 6'f.

The bifurcated lever H is attached to the shaft F to oscillate thereonand secured in position by collars g g, as shown in Fig. 1, and isoscillated to put the arms 8 t in engagement with the cams cl, e, f, andg by means of a lever h, having an elongated slot 2", which engages aroller on the stud or pin l, secured to the cylindrical bearing on ofthe lever H and fulcrumed at its outer end to a lug n on the frame ofthe engine.

The shafts E, F, and G are supported in suitable bearings 0, p, q, and1", so that they may oscillate and reciprocate therein, as required.

In starting the engine the lever H is turned axially on the shaft F, soas to bring the arms 8 15 into contact with the small relief-cams f- 8ocated by the cams d, e, f, and g to open the p and g on the hub of thegear-wheel O to relieve the compression of the charge in the cylinder ofthe engine to aid in starting. The engine having been put in motion, thelever 11 is returned into its normal position, when the arms 8 25 willalternately engage the cams d e and open the exhaust-valves to theirfull extent to relieve the cylinders of the waste products.

Having thus fully described my invention, what I claim is l. Avalve-gear for gas-engines provided with a shaft composed of concentricmembers connected to the igniter and the exhaust-valve of the engine andmeans for imparting oscillating motion to one of said members and1ongitudinal reciprocating motion to the other.

2. A valve-gear for gas-engines having a shaft composed of concentricmembers connected to the igniter and the exhaust-valve of the engine andmeans for imparting oscillating motion to one of said members andlongitudinal reciprocating motion intermittently to the other.

3. A valve-gear for gas-engines having a gear-wheel provided with a camon its face, a hub on said wheel provided with a cam on its periphery,an oscillating shaft operated by the cam on the face of the wheel andconnected to the igniter and a reciprocating shaft operated by the cam011 the hub of said wheel and connected to the exhaust-valve.

4. A valve-gear for gas-engines having concentric shafts, a gear-wheelprovided with a cam on the face of the wheel for operating an igniterand cams on its hub for operating an exhaust-valve, an arm connected toone of the shafts and engaging the cam on the face of the wheel and anarm on the other shaft engaging the cams on the hub of said Wheel.

5. A valve-gear for gas-engines having concentric shafts, a gear-wheelprovided with an igniter-cam on the face of the wheel, andexhaust-valve-operatin g cams in different planes on its hub, an armconnected to one of the shafts and engaging the cam on the face of thewheel and the bifurcated arm on the other shaft engaging either of thecams on the hub of said wheel.

6. Avalve-gearforgas-engineshavingthree concentric shafts, a gear-wheelprovided with concentric cams on its face, two of said shafts beingrocking shafts and engaging said cams and connected to the igniters ofthe engine and the third being a reciprocating shaft having a loosebifurcated arm, two sets of cams on the hub of said gear-wheel witheither of which said bifurcation may engage,and means for moving saidarm about its shaft.

In testimony whereof I affix my signature in presence of two witnesses.

EDMUND CELLISON.

W'itncsses:

JAMES E. GRIST, CHAS. DICKERMAN.

